nixpkgs/modules/programs/shadow.nix

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# Configuration for the pwdutils suite of tools: passwd, useradd, etc.
{ config, pkgs, ... }:
let
loginDefs =
''
DEFAULT_HOME yes
SYS_UID_MIN 100
SYS_UID_MAX 499
UID_MIN 1000
UID_MAX 29999
SYS_GID_MIN 100
SYS_GID_MAX 499
GID_MIN 1000
GID_MAX 29999
TTYGROUP tty
TTYPERM 0620
# Ensure privacy for newly created home directories.
UMASK 077
# Uncomment this to allow non-root users to change their account
#information. This should be made configurable.
#CHFN_RESTRICT frwh
'';
in
{
###### interface
options = {
users.defaultUserShell = pkgs.lib.mkOption {
default = "/run/current-system/sw/bin/bash";
description = ''
This option defines the default shell assigned to user
accounts. This must not be a store path, since the path is
used outside the store (in particular in /etc/passwd).
Rather, it should be the path of a symlink that points to the
actual shell in the Nix store.
'';
};
};
###### implementation
config = {
environment.systemPackages = [ pkgs.shadow ];
environment.etc =
[ { # /etc/login.defs: global configuration for pwdutils. You
# cannot login without it!
source = pkgs.writeText "login.defs" loginDefs;
target = "login.defs";
}
{ # /etc/default/useradd: configuration for useradd.
source = pkgs.writeText "useradd"
''
GROUP=100
HOME=/home
SHELL=${config.users.defaultUserShell}
'';
target = "default/useradd";
}
];
security.pam.services =
[ { name = "chsh"; rootOK = true; }
{ name = "chfn"; rootOK = true; }
{ name = "su"; rootOK = true; forwardXAuth = true; }
{ name = "passwd"; }
# Note: useradd, groupadd etc. aren't setuid root, so it
# doesn't really matter what the PAM config says as long as it
# lets root in.
{ name = "useradd"; rootOK = true; }
{ name = "usermod"; rootOK = true; }
{ name = "userdel"; rootOK = true; }
{ name = "groupadd"; rootOK = true; }
{ name = "groupmod"; rootOK = true; }
{ name = "groupmems"; rootOK = true; }
{ name = "groupdel"; rootOK = true; }
{ name = "login"; startSession = true; allowNullPassword = true; showMotd = true; }
];
2012-07-26 16:49:55 +02:00
security.setuidPrograms = [ "passwd" "chfn" "su" "newgrp" ];
};
}